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spi: bcm2835: implement ctlr->max_transfer_size
The core SPI code will handle splitting transfers if needed as long as ctlr->max_transfer_size is implemented. It does this in __spi_pump_transfer_message() immediately before calling ctlr->prepare_message. So effectively, this change does not alter the behavior of the driver. Also, several peripheral drivers make use of spi_max_transfer_size(), so this should improve compatibility with those drivers. Signed-off-by: David Lechner <dlechner@baylibre.com> Link: https://lore.kernel.org/r/20240126220024.3926403-2-dlechner@baylibre.com Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -1117,19 +1117,6 @@ static int bcm2835_spi_prepare_message(struct spi_controller *ctlr,
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struct spi_device *spi = msg->spi;
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struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
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struct bcm2835_spidev *target = spi_get_ctldata(spi);
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int ret;
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if (ctlr->can_dma) {
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/*
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* DMA transfers are limited to 16 bit (0 to 65535 bytes) by
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* the SPI HW due to DLEN. Split up transfers (32-bit FIFO
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* aligned) if the limit is exceeded.
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*/
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ret = spi_split_transfers_maxsize(ctlr, msg, 65532,
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GFP_KERNEL | GFP_DMA);
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if (ret)
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return ret;
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}
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/*
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* Set up clock polarity before spi_transfer_one_message() asserts
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@ -1219,6 +1206,19 @@ static int bcm2835_spi_setup_dma(struct spi_controller *ctlr,
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return 0;
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}
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static size_t bcm2835_spi_max_transfer_size(struct spi_device *spi)
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{
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/*
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* DMA transfers are limited to 16 bit (0 to 65535 bytes) by
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* the SPI HW due to DLEN. Split up transfers (32-bit FIFO
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* aligned) if the limit is exceeded.
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*/
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if (spi->controller->can_dma)
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return 65532;
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return SIZE_MAX;
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}
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static int bcm2835_spi_setup(struct spi_device *spi)
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{
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struct spi_controller *ctlr = spi->controller;
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@ -1348,6 +1348,7 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
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ctlr->mode_bits = BCM2835_SPI_MODE_BITS;
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ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
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ctlr->num_chipselect = 3;
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ctlr->max_transfer_size = bcm2835_spi_max_transfer_size;
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ctlr->setup = bcm2835_spi_setup;
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ctlr->cleanup = bcm2835_spi_cleanup;
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ctlr->transfer_one = bcm2835_spi_transfer_one;
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